Effect of System Parameters on Phase Error of Focus-Free Digital Fringe Projection Profilometry System

Document Type : Original Article

Authors

1 Engineering and Surface Metrology Department, National Institute for Standards

2 Physics Department , Faculty of Science, Al-Azhar University

Abstract

Abstract
Digital Fringe projection profilometry (DFPP) is a noncontact, robust and high-resolution system for 3D measurements. In DFPP system uniform fringe patterns are projected on the object surface. These patterns are deformed due to the object height distribution. Image of the deformed patterns is captured by CCD camera, then analyzed by one of fringe analysis techniques to obtain phase map, then unwrapped to get continuous phase map. Finally, a calibration step is done to transform from continuous phase map to X, Y, Z coordinates. Phase calculation is an important parameter that affects the accuracy of measurements. The main source of error in phase calculation is phase error due to nonlinear gamma effect of the system. This paper introduces an experimental investigation of the effect of system parameters (such as fringe intensity, fringe period, surface distance from the camera and projector and finally the ambient illumination) on phase error and system measurements. This work is carried out using a new type of projector. It is a laser projector has the advantage of focus-free projection. Experimental work and results are listed.

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